Environment multi-parameter data acquisition circuit

Abstract

The utility model discloses an environment multi-parameter data acquisition circuit, which comprises a first direct comparison module, a first amplification comparison module, a first comprehensive output module, a second direct comparison module, a second amplification comparison module and a second comprehensive output module, each of the first direct comparison module and the second direct comparison module comprises a first signal input unit, a second signal input unit and a first comparison execution unit; the input end of the first signal input unit is connected with a first temperature signal output by the first temperature sensor or a first humidity signal output by the first humidity sensor; each of the first amplification comparison module and the second amplification comparison module comprises an amplification unit, a first access unit, a second access unit and a second comparison execution unit. According to the environment multi-parameter data acquisition circuit, the problem of alarming when the deviation between the first temperature and the second temperature is too large and the deviation between the first humidity and the second humidity is too large in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to a data acquisition circuit, in particular to an environmental multi-parameter data acquisition circuit. Background Art

[0002] In the process of environmental monitoring, it is necessary to use temperature sensors to detect temperature, humidity sensors to detect humidity, etc. In order to improve the detection accuracy, it is necessary to use multiple temperature sensors, multiple temperature sensors, etc. When the temperature sensor or humidity sensor outputs a signal, it needs to be processed, so a signal acquisition and processing circuit is required.

[0003] In the prior art, a signal acquisition and processing circuit includes an amplification module, which amplifies the signal to obtain an amplified signal, and the amplified signal is convenient for a monitor to identify.

[0004] Although the above-mentioned signal acquisition and processing circuit can realize signal amplification, the following problems still exist: in environmental monitoring, it is necessary to use a first temperature sensor to detect the first temperature at the first position, a second temperature sensor to detect the second temperature at the second position, a first humidity sensor to detect the first humidity at the first position, and a second humidity sensor to detect the second humidity at the second position. In vegetation environment monitoring, it is required that the difference between the first temperature at the first position and the second temperature at the second position is not large, and the difference between the first humidity at the first position and the second humidity at the second position is not large. It is necessary to alarm when the first temperature deviates from the second temperature and the first humidity deviates from the second humidity. However, the existing technology cannot realize an alarm when the deviation between the first temperature and the second temperature is too large and the deviation between the first humidity and the second humidity is too large. Utility Model Content

[0005] The utility model provides an environmental multi-parameter data acquisition circuit to solve the problem in the prior art of alarming when the deviation between the first temperature and the second temperature is too large or the deviation between the first humidity and the second humidity is too large.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses an environmental multi-parameter data acquisition circuit, comprising: a first direct comparison module, a first amplification comparison module, a first comprehensive output module, a second direct comparison module, a second amplification comparison module and a second comprehensive output module;

[0008] The first direct comparison module and the second direct comparison module each include: a first signal input unit, a second signal input unit, and a first comparison execution unit, wherein the input end of the first signal input unit is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the input end of the second signal input unit is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, the output end of the first signal input unit is connected to the non-inverting input end of the first comparison execution unit, the output end of the second signal input unit is connected to the inverting input end of the first comparison execution unit, and the output end of the first comparison execution unit is the output end of the first direct comparison module or the output end of the second direct comparison module;

[0009] The first amplification and comparison module and the second amplification and comparison module each include: an amplification unit, a first access unit, a second access unit, and a second comparison execution unit, wherein the input end of the amplification unit and the first access unit are both connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, the output end of the amplification unit is connected to the input end of the second access unit, the input end of the second access unit is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the output end of the first access unit is connected to the non-inverting input end of the second comparison execution unit, the output end of the second access unit is connected to the inverting input end of the second comparison execution unit, and the output end of the second comparison execution unit is the output end of the first amplification and comparison module or the output end of the second amplification and comparison module;

[0010] The first direct comparison module and the first amplification comparison module are both connected to the first temperature signal and the second temperature signal, the output end of the first direct comparison module and the output end of the first amplification comparison module are both connected to the first integrated output module, the second direct comparison module and the second amplification comparison module are both connected to the first humidity signal and the second humidity signal, the output end of the second direct comparison module and the output end of the second amplification comparison module are both connected to the second integrated output module, and the output end of the first integrated output module and the output end of the second integrated output module are respectively connected to the first input end or the second input end of the external monitor.

[0011] Preferably, the first signal input unit includes: a resistor R1, a sliding rheostat R2 and a resistor R3, one end of the resistor R1 is connected to a 5V voltage, the other end of the resistor R1 is connected to the cathode of the Zener diode D1, the anode of the Zener diode D1 and the first fixed end of the sliding rheostat R2 are grounded, the second fixed end of the sliding rheostat R2 is connected to the connection point between the resistor R1 and the Zener diode D1, the third leg of the Zener diode D1 is connected to the sliding end of the sliding rheostat R2, the second fixed end of the sliding rheostat R2 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, and the second end of the resistor R3 is the output end of the first signal input unit.

[0012] Preferably, the second signal input unit includes: a resistor R4 and a sliding rheostat R5, the first end of the resistor R4 is connected to the first fixed end of the sliding rheostat R5, the second fixed end of the sliding rheostat R5 is grounded, the first fixed end of the sliding rheostat R5 is connected to the sliding end of the sliding rheostat R5, the first fixed end of the sliding rheostat R5 is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, and the first fixed end of the sliding rheostat R5 is the output end of the second signal input unit.

[0013] Preferably, the first comparison execution unit includes: resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, a Zener diode D1, a diode D2, a comparator U1 and a capacitor C1, the first end of the resistor R6 is the non-inverting input end of the first comparison execution unit, the second end of the resistor R6 is connected to the non-inverting input end of the comparator U1 and one end of the resistor R8, the other end of the resistor R8 is grounded, the inverting input end of the comparator U1 is connected to one end of the resistor R7, the other end of the resistor R7 is the inverting input end of the first comparison execution unit, the inverting input end of the comparator U1 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to the output end of the comparator U1, the output end of the comparator U1 is connected to the first end of the resistor R10, the second end of the resistor R10 is the output end of the first comparison execution unit, the second end of the resistor R10 is connected to the cathode of the diode D2, the anode of the diode D2 and the negative electrode of the capacitor C1 are both grounded, and the positive electrode of the capacitor C1 is connected to the second end of the resistor R10.

[0014] Preferably, the amplification unit includes: a resistor R11, a comparator U2 and a capacitor C2, the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor is connected to the inverting input terminal of the comparator U2, the non-inverting input terminal of the comparator U2 is connected to a 4.096V voltage, the high voltage terminal of the comparator U2 is connected to a 5V voltage and the positive electrode of the capacitor C2, the negative electrode of the capacitor C2 is grounded, and the output terminal of the comparator U2 is the output terminal of the amplification unit.

[0015] Preferably, the first connecting unit includes: a resistor R12, a first end of the resistor R12 is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, and a second end of the resistor R12 is the output end of the first connecting unit.

[0016] Preferably, the second access unit includes: a resistor R13 and a resistor R14, the first end of the resistor R13 is connected to the output end of the amplification unit, the first end of the resistor R13 is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the second end of the resistor R13 is connected to the first end of the resistor R14, the second end of the resistor R14 is grounded, and the first end of the resistor R14 is the output end of the second access unit.

[0017] Preferably, the second comparison execution unit includes: a comparator U3, a resistor R15, a resistor R16, a diode D3 and a capacitor C3, the non-inverting input end of the comparator U3 is the non-inverting input end of the second comparison execution unit, the inverting input end of the comparator U3 is the inverting input end of the second comparison execution unit, the non-inverting input end of the comparator U3 is connected to the first end of the resistor R15, the second end of the resistor R15 is connected to the output end of the comparator U3, the output end of the comparator U3 is connected to the first end of the resistor R16, the second end of the resistor R16 is connected to the cathode of the diode D3 and the positive pole of the capacitor C3, the anode of the diode D3 and the negative pole of the capacitor C3 are both grounded, and the second end of the resistor R16 is the output end of the second comparison execution unit.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present application, first, a first direct comparison module is set to realize that when the first temperature signal is greater than a specified proportion of the second temperature signal, the first direct comparison module outputs a high level; the first amplification comparison module realizes that when the second temperature signal is amplified by a certain proportion and added to the first temperature signal, the second temperature signal is still larger when it outputs a high level; the second temperature signal direct comparison module realizes that when the first humidity signal is greater than a specified proportion of the second humidity signal, the first direct comparison module outputs a high level; the second amplification comparison module realizes that when the second humidity signal is amplified by a certain proportion and added to the first humidity signal, the second humidity signal is still larger when it outputs a high level; the first integrated output module and the second integrated output module are both OR gates; when the first direct comparison module outputs a high level or the first amplification comparison module outputs a high level, the first integrated output module outputs a high level, and the external controller issues an alarm that the deviation between the first temperature signal and the second temperature signal is too large; when the second direct comparison module outputs a high level or the second amplification comparison module outputs a high level, the first integrated output module outputs a high level, and the external controller issues an alarm that the deviation between the first humidity signal and the second humidity signal is too large, thereby realizing automatic judgment and processing of the first temperature signal and the second temperature signal, and the first humidity signal and the second humidity signal, which brings convenience to multi-parameter monitoring of the environment.

[0020] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit diagram of the first direct comparison module or the second direct comparison module in the environmental multi-parameter data acquisition circuit.

[0022] Figure 2 This is a circuit diagram of the first amplification and comparison module or the second amplification and comparison module in the environmental multi-parameter data acquisition circuit. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1 as well as Figure 2 As shown, the utility model discloses an environmental multi-parameter data acquisition circuit including: a first direct comparison module, a first amplification comparison module, a first integrated output module, a second direct comparison module, a second amplification comparison module and a second integrated output module; the first direct comparison module and the second direct comparison module both include: a first signal input unit, a second signal input unit and a first comparison execution unit, the input end of the first signal input unit is connected to the first temperature signal PT-A1 output by the first temperature sensor or the first humidity signal PT-B1 output by the first humidity sensor, the input end of the second signal input unit is connected to the second temperature signal PT-A2 output by the second temperature sensor or the second humidity signal PT-B2 output by the second humidity sensor, the output end of the first signal input unit is connected to the non-inverting input end of the first comparison execution unit, the output end of the second signal input unit is connected to the inverting input end of the first comparison execution unit, and the output end of the first comparison execution unit is the output end of the first direct comparison module or the output end of the second direct comparison module; the first amplification comparison module and the second amplification comparison module both include: an amplification unit, a first access unit, a second access unit and a second comparison execution unit, the input end of the amplification unit and the first access unit are both connected to the second temperature sensor The output of the amplifying unit is connected to the input of the second access unit, the input of the second access unit is connected to the first temperature signal PT-A1 output by the first temperature sensor or the first humidity signal PT-B1 output by the first humidity sensor, the output of the first access unit is connected to the non-inverting input of the second comparison execution unit, the output of the second access unit is connected to the inverting input of the second comparison execution unit, and the output of the second comparison execution unit is the output of the first amplifying and comparing module or the output of the second amplifying and comparing module; the first direct comparison module and the first amplifying and comparing module are both connected to the first temperature signal PT-A1 and the second temperature signal PT-A2, the output of the first direct comparison module and the output of the first amplifying and comparing module are both connected to the first integrated output module, the second direct comparison module and the second amplifying and comparing module are both connected to the first humidity signal PT-B1 and the second humidity signal PT-B2, the output of the second direct comparison module and the output of the second amplifying and comparing module are both connected to the second integrated output module, and the output of the first integrated output module and the output of the second integrated output module are respectively connected to the first input or the second input of the external monitor.

[0025] The first signal input unit includes: a resistor R1, a sliding rheostat R2, and a resistor R3. One end of resistor R1 is connected to a 5V voltage, the other end of resistor R1 is connected to the cathode of a Zener diode D1, the anode of Zener diode D1 and the first fixed end of sliding rheostat R2 are grounded, the second fixed end of sliding rheostat R2 is connected to the junction between resistor R1 and Zener diode D1, the third leg of Zener diode D1 is connected to the sliding end of sliding rheostat R2, the second fixed end of sliding rheostat R2 is connected to the first end of resistor R3, the second end of resistor R3 is connected to the first temperature signal PT-A1 output by the first temperature sensor or the first humidity signal PT-B1 output by the first humidity sensor, and the second end of resistor R3 serves as the output end of the first signal input unit. Changing the resistance of sliding rheostat R2 can change the voltage outputted by the output end of the first signal input unit, so that the first temperature signal PT-A1 or the first humidity signal PT-B1 is added to the first specified voltage.

[0026] The second signal input unit includes: a resistor R4 and a sliding rheostat R5. The first end of the resistor R4 is connected to the first fixed end of the sliding rheostat R5, the second fixed end of the sliding rheostat R5 is grounded, the first fixed end of the sliding rheostat R5 is connected to the sliding end of the sliding rheostat R5, the first fixed end of the sliding rheostat R5 is connected to the second temperature signal PT-A2 output by the second temperature sensor or the second humidity signal PT-B2 output by the second humidity sensor, and the first fixed end of the sliding rheostat R5 is the output end of the second signal input unit. By adjusting the resistance value of the sliding rheostat R5, the output voltage of the second signal input unit can be adjusted to a specified ratio of the second temperature signal PT-A2 or the second humidity signal PT-B2, thereby achieving the comparison of the first temperature signal PT-A1 with the specified ratio of the second temperature signal PT-A2, and the comparison of the first humidity signal PT-B1 with the specified ratio of the second humidity signal PT-B2 at the subsequent first comparison execution unit.

[0027] The first comparison execution unit includes: resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, Zener diode D1, diode D2, comparator U1 and capacitor C1, the first end of resistor R6 is the non-inverting input end of the first comparison execution unit, the second end of resistor R6 is connected to the non-inverting input end of comparator U1 and one end of resistor R8, the other end of resistor R8 is grounded, the inverting input end of comparator U1 is connected to one end of resistor R7, the other end of resistor R7 is the inverting input end of the first comparison execution unit, the inverting input end of comparator U1 is connected to one end of resistor R9, the other end of resistor R9 is connected to the output end of comparator U1, the output end of comparator U1 is connected to the first end of resistor R10, the second end of resistor R10 is the output end of the first comparison execution unit, the second end of resistor R10 is connected to the cathode of diode D2, the anode of diode D2 and the negative electrode of capacitor C1 are both grounded, and the positive electrode of capacitor C1 is connected to the second end of resistor R10. It realizes that when the first temperature signal is greater than the specified ratio of the second temperature signal, a high level is output, and when the first humidity signal is greater than the specified ratio of the second humidity signal, a high level is output; when the first temperature signal is less than the specified ratio of the second temperature signal, a low level is output, and when the first humidity signal is less than the specified ratio of the second humidity signal, a low level is output.

[0028] The amplification unit includes a resistor R11, a comparator U2, and a capacitor C2. The second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor is connected to the inverting input of comparator U2. The non-inverting input of comparator U2 is connected to a 4.096V voltage. The high-voltage terminal of comparator U2 is connected to a 5V voltage and the positive terminal of capacitor C2. The negative terminal of capacitor C2 is grounded. The output of comparator U2 serves as the output of the amplification unit. This amplifies the second temperature signal or the second humidity signal to obtain a k-fold second temperature signal or a k-fold second humidity signal.

[0029] The first connection unit includes a resistor R12, a first end of which is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, and a second end of which is the output end of the first connection unit. The resistor R12 serves to stabilize voltage.

[0030] The second connection unit includes resistors R13 and R14. The first end of resistor R13 is connected to the output end of the amplification unit and receives the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor. The second end of resistor R13 is connected to the first end of resistor R14, which is grounded. The first end of resistor R14 serves as the output end of the second connection unit. Resistors R13 and R14 function to stabilize voltage. Simultaneously, the input is: k times the second temperature signal or k times the second humidity signal + the first temperature signal or the second temperature signal.

[0031] The second comparison execution unit includes: a comparator U3, a resistor R15, a resistor R16, a diode D3, and a capacitor C3. The non-inverting input of comparator U3 serves as the non-inverting input of the second comparison execution unit, and the inverting input of comparator U3 serves as the inverting input of the second comparison execution unit. The non-inverting input of comparator U3 is connected to the first end of resistor R15, the second end of resistor R15 is connected to the output of comparator U3, the output of comparator U3 is connected to the first end of resistor R16, the second end of resistor R16 is connected to the cathode of diode D3 and the positive terminal of capacitor C3, the anode of diode D3 and the negative terminal of capacitor C3 are both grounded, and the second end of resistor R16 serves as the output of the second comparison execution unit. The first access unit supplies the second comparison execution unit with a voltage W1, where W1 = the second temperature signal or the second humidity signal. The second access power supply supplies the second comparison execution unit with a voltage W2, where W2 = k times the second temperature signal or k times the second humidity signal + the first temperature signal or the first temperature signal, so that a high level is output when W1 is greater than W2, and a low level is output when W1 is less than W2.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Environmental multi-parameter data acquisition circuit, characterized in that, include: A first direct comparison module, a first amplification and comparison module, a first integrated output module, a second direct comparison module, a second amplification and comparison module, and a second integrated output module; The first direct comparison module and the second direct comparison module each include: a first signal input unit, a second signal input unit, and a first comparison execution unit, wherein the input end of the first signal input unit is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the input end of the second signal input unit is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, the output end of the first signal input unit is connected to the non-inverting input end of the first comparison execution unit, the output end of the second signal input unit is connected to the inverting input end of the first comparison execution unit, and the output end of the first comparison execution unit is the output end of the first direct comparison module or the output end of the second direct comparison module; The first amplification and comparison module and the second amplification and comparison module each include: an amplification unit, a first access unit, a second access unit, and a second comparison execution unit, wherein the input end of the amplification unit and the first access unit are both connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, the output end of the amplification unit is connected to the input end of the second access unit, the input end of the second access unit is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the output end of the first access unit is connected to the non-inverting input end of the second comparison execution unit, the output end of the second access unit is connected to the inverting input end of the second comparison execution unit, and the output end of the second comparison execution unit is the output end of the first amplification and comparison module or the output end of the second amplification and comparison module; The first direct comparison module and the first amplification comparison module are both connected to the first temperature signal and the second temperature signal, the output end of the first direct comparison module and the output end of the first amplification comparison module are both connected to the first integrated output module, the second direct comparison module and the second amplification comparison module are both connected to the first humidity signal and the second humidity signal, the output end of the second direct comparison module and the output end of the second amplification comparison module are both connected to the second integrated output module, and the output end of the first integrated output module and the output end of the second integrated output module are respectively connected to the first input end or the second input end of the external monitor.

2. The environmental multi-parameter data acquisition circuit according to claim 1, characterized in that: The first signal input unit includes: a resistor R1, a sliding rheostat R2 and a resistor R3, one end of the resistor R1 is connected to a 5V voltage, the other end of the resistor R1 is connected to the cathode of the Zener diode D1, the anode of the Zener diode D1 and the first fixed end of the sliding rheostat R2 are grounded, the second fixed end of the sliding rheostat R2 is connected to the connection point between the resistor R1 and the Zener diode D1, the third leg of the Zener diode D1 is connected to the sliding end of the sliding rheostat R2, the second fixed end of the sliding rheostat R2 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, and the second end of the resistor R3 is the output end of the first signal input unit.

3. The environmental multi-parameter data acquisition circuit according to claim 2, characterized in that: The second signal input unit includes: a resistor R4 and a sliding rheostat R5, the first end of the resistor R4 is connected to the first fixed end of the sliding rheostat R5, the second fixed end of the sliding rheostat R5 is grounded, the first fixed end of the sliding rheostat R5 is connected to the sliding end of the sliding rheostat R5, the first fixed end of the sliding rheostat R5 is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, and the first fixed end of the sliding rheostat R5 is the output end of the second signal input unit.

4. The environmental multi-parameter data acquisition circuit according to claim 3, characterized in that: The first comparison execution unit includes: resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, Zener diode D1, diode D2, comparator U1 and capacitor C1, the first end of resistor R6 is the non-inverting input end of the first comparison execution unit, the second end of resistor R6 is connected to the non-inverting input end of comparator U1 and one end of resistor R8, the other end of resistor R8 is grounded, the inverting input end of comparator U1 is connected to one end of resistor R7, the other end of resistor R7 is the inverting input end of the first comparison execution unit, the inverting input end of comparator U1 is connected to one end of resistor R9, the other end of resistor R9 is connected to the output end of comparator U1, the output end of comparator U1 is connected to the first end of resistor R10, the second end of resistor R10 is the output end of the first comparison execution unit, the second end of resistor R10 is connected to the cathode of diode D2, the anode of diode D2 and the negative electrode of capacitor C1 are both grounded, and the positive electrode of capacitor C1 is connected to the second end of resistor R10.

5. The environmental multi-parameter data acquisition circuit according to any one of claims 1 to 4, characterized in that: The amplification unit includes: a resistor R11, a comparator U2 and a capacitor C2. The second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor is connected to the inverting input terminal of the comparator U2, the non-inverting input terminal of the comparator U2 is connected to a 4.096V voltage, the high-voltage terminal of the comparator U2 is connected to a 5V voltage and the positive electrode of the capacitor C2, the negative electrode of the capacitor C2 is grounded, and the output terminal of the comparator U2 is the output terminal of the amplification unit.

6. The environmental multi-parameter data acquisition circuit according to claim 5, characterized in that: The first connecting unit includes: a resistor R12, a first end of the resistor R12 is connected to the second temperature signal output by the second temperature sensor or the second humidity signal output by the second humidity sensor, and a second end of the resistor R12 is an output end of the first connecting unit.

7. The environmental multi-parameter data acquisition circuit according to claim 6, characterized in that: The second access unit includes: a resistor R13 and a resistor R14, the first end of the resistor R13 is connected to the output end of the amplification unit, the first end of the resistor R13 is connected to the first temperature signal output by the first temperature sensor or the first humidity signal output by the first humidity sensor, the second end of the resistor R13 is connected to the first end of the resistor R14, the second end of the resistor R14 is grounded, and the first end of the resistor R14 is the output end of the second access unit.

8. The environmental multi-parameter data acquisition circuit according to claim 7, characterized in that: The second comparison execution unit includes: a comparator U3, a resistor R15, a resistor R16, a diode D3 and a capacitor C3. The non-inverting input end of the comparator U3 is the non-inverting input end of the second comparison execution unit, the inverting input end of the comparator U3 is the inverting input end of the second comparison execution unit, the non-inverting input end of the comparator U3 is connected to the first end of the resistor R15, the second end of the resistor R15 is connected to the output end of the comparator U3, the output end of the comparator U3 is connected to the first end of the resistor R16, the second end of the resistor R16 is connected to the cathode of the diode D3 and the positive electrode of the capacitor C3, the anode of the diode D3 and the negative electrode of the capacitor C3 are both grounded, and the second end of the resistor R16 is the output end of the second comparison execution unit.

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